About the wedding day of Seto Ryosuke, an elementary school teacher, and Aikawa Mizuki, a lemon farmer. Right before the ceremony, Mizuki finds out that his partner didn't tell his parents, relatives, and friends that he is marrying a man. This discovery starts a series of events the two have to face, like a furious outburst of Ryosuke's father, a big fight between heads of the two families, as well as an appearance of Mizuki's ex-boyfriend.